Resistor Tools Pro vs RMS Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Resistor Tools Pro
This utility app offers a suite of tools for calculating and finding resistor combinations. It's designed for electronics enthusiasts and professionals needing to determine series, parallel, and voltage divider configurations. Save and share your calculations easily.
- Calculate series/parallel resistance
- Find resistor combinations for desired resistance
- Voltage divider ratio and value calculation
- Inverting amplifier gain calculation
- Save combinations to CSV
- Share via AirDrop
- Upload CSV to iCloud Drive
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This app is a collection of resistor calculators. It is suitable for hobbyist or electronic engineer. * Calculate resistance of 2 resistors in series or parallel * Find out combinations of 2 resistors in series/parallel making a desired resistance * Calculate ratio of R1/R2 and voltage divider * Find out resistor values of making voltage divider ratio * Find out resistor values of making inverting amplifier gain * Save combination values in CSV file * Share document via AirDrop * Upload CSV file to iCloud Drive (For iOS8 or later)
RMS Calculator
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How should the effective value be calculated? What is the amplitude of the effective value of 100V? In such a case, do you have any experience of calculating the effective value while checking the calculation formula every time? This app can quickly convert the effective value and amplitude of AC waveforms. There are 4 types of conversion units: rms value, average value, amplitude, and Peak to Peak Amplitude. By inputting the amplitude or effective value of the AC waveform and selecting the unit of the input value, the value converted into 4 types of units will be displayed.
Screenshots
Verdict
The clearest difference is update cadence: Resistor Tools Pro at every 2 months against RMS Calculator's every 15 months. Resistor Tools Pro also leads on price ($0.99 vs $1.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Resistor Tools Pro costs $0.99 and RMS Calculator $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Resistor Tools Pro ships an update every 2 months, RMS Calculator every 15 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.
| Parameter | Resistor Tools Pro | RMS Calculator |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 4.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months — better | Every 15 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 4 MB | 8 MB |
| Age rating | 4+ | +4 |
| Developer | Siu Yuen Ho | Kei Suefuji |
In-app purchases
Resistor Tools Pro
No in-app purchases
RMS Calculator
No in-app purchases
Questions
Is Resistor Tools Pro free?
Is RMS Calculator free?
Do Resistor Tools Pro or RMS Calculator have ads?
Which is updated more often, Resistor Tools Pro or RMS Calculator?
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